The main argument is that this will benefit the environment, which it should. But there is an alternative (i.e. economic) argument as well. The standard cell phone charging technology will reduce the number of cell phone chargers that cell phone manufacturers will need to produce, hence lowering input costs for cell phone chargers.

Hence it seems as the net benefits of standardized cell phone chargers is greater than the net benefits of propriatary cell phone chargers. Coupled with the increase in competition of firms like PowerMat, who can charge multiple types of devices, this is a natural direction - profit enhancing - for cell phone retailers to pursue.